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ACCOUNTS RECEIVABLE, NARRATIVE (Details)	Jun. 30, 2018 Rate	Jun. 30, 2017 Rate
Receivables [Abstract]
Trade accounts receivable, two largest customers, percentage	34.00%	31.00%
Foreign trade accounts receivable, denominated in US dollars, percentage	26.00%	15.00%

X

- Definition

Foreign accounts receivable denominated in US dollars

+ References

No definition available.

+ Details

Name:	koss_ForeignaccountsreceivabledenominatedinUSdollars
Namespace Prefix:	koss_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percent of gross accounts receivable with two largest customers

+ References

No definition available.

+ Details

Name:	koss_PercentOfGrossAccountsReceivableWithTwoLargestCustomers
Namespace Prefix:	koss_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration